<p>staff图片：<%= f.text_field :staff_num, :class => :mini, :value => 2 %>张</p>
<p>BGM file name：<%= f.text_field :file_name, :class => :long %></p>
<p>BGM length(second)：<%= f.text_field :length, :class => :mini, :maxlength => 4 %></p>
<p>BGM在此部分开始 <%= f.text_field :offset, :class => :mini, :maxlength => 2, :value => 0 %> 秒后播放</p>
<p>BGM结束后此部分还需剩余 <%= f.text_field :end, :class => :mini, :maxlength => 2, :value => 0 %> 秒静音时间</p>
